Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 42: Phase Transitions III

MM 42.4: Vortrag

Donnerstag, 28. Februar 2008, 14:45–15:00, H 0107

Intrinsic Properties and Growth of Iron Palladium Thin Films — •Iris Kock and S.G. Mayr — 1. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Iron Palladium alloys of a composition around Fe₇₀Pd₃₀ are among the most promising candidates for magnetic shape memory alloys. With regard to possible application in miniaturized devices the intrinsic properties of thin films prepared by electron beam evaporation were investigated and compared to those of splat quenched foils. The developement of mechanical stress and surface morphology during film growth were studied and linked to crystal structure, microstructure and magnetic properties to determine the growth mechanisms. It was found that deposition at room temperature leads to films in a bct structure with an out of plane magnetization. Transformation to the fcc austenite phase can be achieved by appropriate heat treatment. Splat quenching directly yields foils of about 60 microns thickness in the austenite phase that can transform into the martensite phase upon cooling.

Financial support by DFG SPP1239 TP C4 is gratefully acknowledged.